SUMMARIZED CONDENSED CONSOLIDATING INFORMATION (Condensed Consolidating Statement of Income) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Rental income	$ 25,420	$ 21,294	$ 73,903	$ 57,483
Interest income	618	176	979	393
Total revenues	26,038	21,470	74,882	57,876
Expenses:
Depreciation and amortization	7,496	6,850	22,356	19,227
Interest	9,538	7,624	25,384	22,726
General and administrative	3,778	4,652	11,588	10,245
(Income) loss in subsidiary		0	0	0
Total expenses	20,812	19,126	59,328	52,198
Net income	5,226	2,344	15,554	5,678
Net income per common share, basic (USD per shares)	$ 0.14	$ 0.07	$ 0.42	$ 0.20
Net income per common share, diluted (USD per shares)	$ 0.14	$ 0.07	$ 0.42	$ 0.20
Weighted-average number of common shares outstanding, basic (in shares)	37,178,162	32,986,657	37,121,384	27,797,411
Weighted-average number of common shares outstanding, diluted (in shares)	37,465,114	33,049,621	37,276,013	27,891,690
Parent Company [Member]
Revenues:
Rental income	0	0	0	0
Interest income	7	12	15	53
Total revenues	7	12	15	53
Expenses:
Depreciation and amortization	12	13	36	42
Interest	0	0	0	0
General and administrative	3,627	2,104	10,548	7,419
(Income) loss in subsidiary	8,858	4,449	26,123	13,086
Total expenses	3,639	2,117	10,584	7,461
Net income	5,226	2,344	15,554	5,678
Issuers [Member]
Revenues:
Rental income	0	0	0	0
Interest income	0	0	0	0
Total revenues	0	0	0	0
Expenses:
Depreciation and amortization	0	0	0	0
Interest	6,162	4,755	15,675	14,157
General and administrative	0	0	2	1
(Income) loss in subsidiary	15,020	9,204	41,800	27,244
Total expenses	6,162	4,755	15,677	14,158
Net income	8,858	4,449	26,123	13,086
Combined Guarantor Subsidiaries [Member]
Revenues:
Rental income	18,972	15,003	54,558	38,609
Interest income	611	163	964	338
Total revenues	19,583	15,166	55,522	38,947
Expenses:
Depreciation and amortization	5,446	4,763	16,170	12,874
Interest	708	336	1,887	981
General and administrative	133	2,522	971	2,733
(Income) loss in subsidiary	(52)	128	94	327
Total expenses	6,287	7,621	19,028	16,588
Net income	13,244	7,673	36,588	22,686
Combined Non-Guarantor Subsidiaries [Member]
Revenues:
Rental income	6,448	6,291	19,345	18,874
Interest income	0	1	0	2
Total revenues	6,448	6,292	19,345	18,876
Expenses:
Depreciation and amortization	2,038	2,074	6,150	6,311
Interest	2,668	2,533	7,822	7,588
General and administrative	18	26	67	92
(Income) loss in subsidiary	0	0	0	0
Total expenses	4,724	4,633	14,039	13,991
Net income	1,724	1,659	5,306	4,885
Elimination [Member]
Revenues:
Rental income	0	0	0	0
Interest income	0	0	0	0
Total revenues	0	0	0	0
Expenses:
Depreciation and amortization	0	0	0	0
Interest	0	0	0	0
General and administrative	0	0	0	0
(Income) loss in subsidiary	(23,826)	(13,781)	(68,017)	(40,657)
Total expenses	0	0	0	0
Net income	$ (23,826)	$ (13,781)	$ (68,017)	$ (40,657)